At a glance
Learn how to read and compare IVF success rates in Thailand, including the limitations of clinic-reported data and the questions to ask for a fair assessment.
When you’re researching IVF in Thailand, success rates are often the first numbers you see. But those percentages can be misleading if you don’t know what they actually measure. This guide explains how to interpret IVF success rates, why they vary between clinics, and what questions to ask to make a fair comparison.
At a Glance: Key Points to Remember
- Success rates depend heavily on patient age, diagnosis, and embryo status.
- Clinics may report different endpoints (e.g., clinical pregnancy vs. live birth).
- No standardized reporting exists in Thailand, so data may not be directly comparable.
- Always ask for the clinic’s own data broken down by age and embryo type.
What Do IVF Success Rates Actually Measure?
IVF success can be reported in several ways, and each tells a different story. The most common measures include:
- Clinical pregnancy rate: The percentage of cycles that result in a visible pregnancy on ultrasound.
- Live birth rate: The percentage of cycles that result in a live baby. This is the most meaningful outcome for most patients.
- Ongoing pregnancy rate: A pregnancy that has progressed past a certain point (e.g., 12 weeks).
Some clinics may also report success per embryo transfer, while others report per cycle started. These denominators are not the same, so comparing them directly can be misleading.
Why Success Rates Vary Between Clinics
Even if two clinics report the same percentage, the underlying patient populations may be very different. Key factors that influence success rates include:
- Patient age: Younger women typically have higher success rates. A clinic that treats many older patients may have lower overall rates.
- Diagnosis: Causes of infertility (e.g., male factor, tubal, genetic) affect outcomes.
- Embryo status: Transferring a genetically tested embryo (PGT-A) may have higher implantation rates than untested embryos.
- Cycle type: Fresh vs. frozen embryo transfers can have different success rates.
Without adjusting for these factors, raw percentages are not comparable.
Reporting Standards in Thailand
Thailand does not have a mandatory national registry for IVF outcomes, so clinics may report data in different ways. Some may include only their best-performing age groups, while others may report all cycles. This lack of standardization means you should be cautious when comparing numbers from different clinics.
When you see a success rate, ask: What is the exact definition? What time period does it cover? How many cycles were included? A rate based on a small number of cycles may not be statistically reliable.
Questions to Ask a Clinic About Their Success Data
To make a fair comparison, request the following information directly from the clinic:
- What is your live birth rate per cycle started, broken down by patient age group?
- Do you report success per fresh transfer, frozen transfer, or both?
- How many cycles were included in your latest report?
- Do you include all patients, or only those with a good prognosis?
- What is your success rate for patients with my specific diagnosis?
- Do you offer PGT-A, and how does that affect your success rates?
Ask for written data, and if possible, verify it with your own medical records or a second opinion.
How to Compare Clinics Fairly
When comparing clinics, focus on your own profile. If you are 35 years old with no known fertility issues, a clinic’s overall rate may not reflect your chances. Instead, ask for data specific to your age and situation.
Also consider the clinic’s experience with the treatments you may need, such as PGT-M for genetic disorders. A clinic that performs many PGT cycles may have more refined protocols, but this does not guarantee success.
Remember that success rates are historical data, not a prediction of your outcome. Your individual chances depend on many factors that only your doctor can assess.
Next Steps: Your Checklist
- List the clinics you are considering.
- Request their success rate data in writing, specifying your age and diagnosis.
- Ask about their reporting definitions and cycle numbers.
- Compare the data side by side, but also consider other factors like lab quality, doctor experience, and patient support.
- Discuss your personal prognosis with a fertility specialist before making a decision.
For more information on IVF in Thailand, see our IVF success rates overview and PGT in Thailand guides. You can also browse our patient guides and FAQ for additional insights.
Frequently asked questions
What is the most reliable IVF success rate to look at?
The live birth rate per cycle started is generally the most meaningful measure, as it reflects the chance of having a baby. However, it should be broken down by age and embryo type to be relevant to your situation.
Why do IVF success rates vary so much between clinics in Thailand?
Variation is due to differences in patient demographics, reporting standards, and treatment protocols. Without a national registry, clinics may report data in ways that are not directly comparable.
Can I trust the success rates published on clinic websites?
They can be a starting point, but you should ask for detailed data, including the definition of success, the time period, and the number of cycles. Verify that the data applies to your age and diagnosis.
How does PGT-A affect IVF success rates?
PGT-A can help select embryos with the correct number of chromosomes, which may reduce the risk of implantation failure and miscarriage. However, it does not guarantee a live birth, and success rates still depend on other factors.
Continue your research
Medical information notice: This article is educational and does not replace individual assessment, diagnosis, genetic counselling or treatment advice from a licensed clinician. Provider services, availability, fees and policies should be verified directly before booking.
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